地层应力对掘进巷道稳定性的影响

Formation Stress Influence to Mining Roadway Stability

为了研究地层应力对掘进巷道稳定性的影响,通过掘进巷道应力场理论分析,提出巷道垂直应力与水平应力之间可以通过一个包含构造影响的综合侧压系数来联系,并通过ANSYS数值模拟软件,模拟巷道在不同的侧压系数下有效应力的分布情况,以及巷道各个关键点随侧压系数的变化趋势,结果表明:当侧压系数小于1,巷道的破坏主要是顶底板的移近;当侧压系数后等于1,巷道的破坏主要是断面积的整体变小;当侧压系数大于1,巷道的破坏主要是巷帮的移近,从而导致顶板冒落及底鼓。巷道各个关键点的有效应力随着侧压系数的增大有上升趋势。

In order to study formation stress influence to mining roadway stability,through the analysis of mining roadway stress field theory,the theory that roadway vertical stress and the horizontal stress can contact through a comprehensive lateral pressure coefficient was put forward,by ANSYS numerical simulation software,roadway under different lateral pressure coefficient of the distribution of effective stress and the change trend of each key point with the lateral pressure coefficient of roadway were simulated,the result showed that when the lateral pressure coefficient is less than 1,the destruction of the roadway is mainly of roof and floor closer,when the lateral pressure coefficient is equal to 1,the destruction of the roadway is mainly smaller sectional area of the overall,when the lateral pressure coefficient is greater than 1,the destruction of the roadway is mainly roadway sides closer,cause roof caving and the floor heave. The key points of effective stress of roadway with the increase of lateral pressure coefficient has a rising trend.